Leaching behavior of Rh from spent automotive catalyst using sodium-based oxidants and its kinetics - Engineering Information Institute

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Leaching behavior of Rh from spent automotive catalyst using sodium-based oxidants and its kinetics [CET 2015]
Author(s)
Gunheum Yeun
ABSTRACT
Rhodium (Rh), one of platinum group metals (PGMs), has wide usage applications such as catalyst, electronic equipment, medical device, jewelry and accessory because of its sufficient thermal, chemical, and electrical properties. Recovery methods of PGMs from spent products are roughly divided into two categories; hydrometallurgical method and pyrometallurgical method. Actually, pyrometallurgical methods are useful for large scale recovery, but it consumes high electrical energy and causes serious air pollution. Otherwise, hydrometallurgical methods are relatively simple, cost-effective, and eco-friendly. It is also proper to recover specific PGM elements selectively through leaching, filtration, and separation. Leaching process is important in hydrometallurgical method because appropriate leaching conditions can ionize PGM elements in acid solutions selectively, efficiently despite of very high dissolution resistance of PGM. In this study, leaching out Rh from spent automotive catalyst powder was carried out using leachants containing oxidants. In addition, Rh leaching kinetics was studied according to theoretical rate equations based on diffusion-controlled mechanism to understand leaching reaction and its rate. To investigate leaching efficiency of Rh, two types of leachants were used. One is aqua regia; the other is a mixed solution HCl and H2SO4 with the addition of sodium-based oxidants (Na2CO3, NaHSO4).
KEYWORDS
Leaching behavior, spent automotive catalyst, sodium-based oxidants
References

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